Insulator



3 Sheds-Sheet 1.

Patented May 7, 1889.

F. M. LOGKE & J. LAPP.

INSULATOR.

(No Model.)

(No Model.) 3 Sheets--Sheet 2.

P. M. LOCKE & J. LAPP. INSULATOR.

No. 402,752. Patented May '7, 1889.

qmitweowo I 1 m gmw wtms' UNITED STATES FREDERICK M. LOCKE, OF VICTOR, AND JOHN LAPP, OF HONEOYE FALLS,

NElV YORK.

INSULATOR.

SPECIFICATION formingpart of Letters Patent No. 402,752, dated May '7, 1889.

(No model.)

To' all whom it may concern.-

Be it known that we, FREDERICK M. LOCKE and JOHN LAPP, of Victor, ()ntario county, and lloneoye Falls, Monroe county, in the State of New York, respectively, citizens of the United States, have invented certain new and useful Improvements in Insulators, of which the following is a specification, reference being had to the accompanying drawings.

Our invention relates to insulators for electrical circuitwires, which form a connection or support for the wire from the cross-arm upon a pole, and which insulators consist of a petticoated glass body, a metallic hook inserted into the body, and a non-conducting packing around the hook.

The object of our invention is to provide more perfect insulation; to protect the insulating-surface from wetting and from snow or sleet; to protect and preserve the cross-arm by inserting the insulator into the lower side thereof; to provide a secure attachment of the insulator to the cross-arm and at the same time have it easily detachable therefrom, and to increase the length of the insulating-surface between the line-wire and the cross-arm.

Our invention consists in the several novel features of construction and operation hereinafter described, and which are specifically set forth in the claims hereunto annexed.

Figure 1 is a sectional elevation, on a vertical line, of the insulator set, with the linehook broken away just below the insulator. Fig. 2 is a bottom plan view of the insulator, showing the plan of the concentric flanges. Fig. 3 a sectional elevation of the insulator set, the line-hook being provided with a coarse screw-shank, the insulator threaded to correspond, and a packing interposed between the hook and insulator. This figure shows the hooks complete which are designed to carry the wires. Fig. i represents a front elevation of the line-hook, showing, also, in dotted lines the elastic packing drawn over the head and neck and part of the body, and also showing in dotted lines the insulator and the packing in which the head and neck are embedded. Fig. 5 is a section horizontally ot the line-hook on the line a; at, Fig. l. Figs. 6 and 7 show horizontal sections of two styles of flattened neck on line y 'y in Fig. i.

It is constructed as follows:

In the drawings, A represents a portion of a cross-arm or other supportfor the line-wire, and B is the glass insulator let into the under side of the cross-arm. In this glass we make a groove, S, extending horizontally clear around the external periphery of the insulator. The lower part of this insulator flares outward, substantially as shown, and the bottom within the flare is broken up by the concentric grooves 1 2 and the central opening,

3, thereby creating three concentric flanges or petticoats, D E F, by means of which the insulating-surface across the bottom of the insulator is elongated according to the depth of the grooves.

I is a frustoconical or coarsely screwthreaded recess within the body of the glass B, of which 3 is the external opening.

0 is the hook or wire support consisting of a body, a, a neck, 5, a head, 6, and the supporting-prongs 7, the body being made either cylindrical or flattened, and the neck may be either cylindrical or flattened and may be con- 7 5 siderably smaller in circumference than the body, as shown in Fig. 2; or the neck may be in the form of a spiral at the bottom of the coarse screw-threads, as shown. The hook O is insulated from the glass B by being embedded So in the non-conducting material K, which is filled into the recess around the head and shank and part of the body of the hook by pouring in a mixture of melted sulphur and sand; and to more completely insulate it, and, 8 5 furthermore, to protect the glass from breakage by the strain of the wire thereon, and to provide an elastic cushion. for the line-hook within the glass, we cover the head and neck with a rubber sleeve, in, stretched on in such a way as to conform itself and to fit close to the whole surface of the head, neck, and body, and then when the hook is inserted, either by screwing in or by being embedded in the sand and sulphur, the hook can always give some- 5 what with the strain, and thus relieve the glass. By making a coarse rounded thread, avoiding all sharp edges and angles, the rubber will not be cut by screwing in, and it will conform itself to the surface of thebody, neck, I00 and head much better, fitting closer thereto.

It will be observed that when the glass is secured in the cross-arm by the removable transverse pins H the wire is most perfectly insulated from the cross-arm by the rubber sleeve m and the long or elongated petticoated lower face of the glass, so that even if the grooves and petticoats become wet the loss of electricity would be merely nominal, if any at all were lost. In fact, the insulation is so perfect that our insulator can be safely Fused upon metallic cross-arms.

and an insulating-packing within the recess and around the line-hook, head, neck, and a part of the cylindrical body, substantially as described.

3. The combination, with an insulator recessed to receive the line-hook and provided with concentric petticoats upon its lower end outside of the recess, of a line-hook consisting of a body having a line-support at one end, a cylindrical body, a flattened neck, and a spherical head upon the opposite end, and a non-conducting packing in said recess inclosing the head, neck, and part of the cylindrical body, substantially as described.

In witness whereof we have hereunto set our hands this 25th day of September, 1888.

' FREDERICK M. 'LOOKE.

JOHN LAPP. In presence of H. P. DENISON, O. W. SMITH. 

